/Engine/Source/Runtime/GeometryCore/Public/Spatial/PointHashGrid2.h
Find nearest point in grid, within a given sphere, without locking / thread-safety.
the found pair (Value,DistanceFunc(Value)), or (InvalidValue,MaxDouble) if not found
TPair< PointDataType, RealType > FindNearestInRadius ( const [TVector2](API\Runtime\Core\Math\TVector2)< RealType > & QueryPoint, RealType Radius, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< RealType(const PointDataType &)> DistanceSqFunc, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< bool(const PointDataType &)> IgnoreFunc ) const